600 Madison Avenue

600 Madison Avenue has about 316,000 square feet of floor area in total, including 304,000 square feet of office and 12,000 square feet of retail, according to NYC PLUTO 26v2. These are the city's estimates for the whole building, not space that is available.

City records list 1965 as the year built. The building is 25 floors tall.

City records list 18-30 East 58th Street and 600-606 Madison Avenue on the same tax lot (BBL 1012930059) as 600 Madison Avenue. A space listed on Leasemark at any of these addresses shows up on this page.

600 Madison Avenue is in ZIP code 10022, according to the city's tax lot records (NYC PLUTO 26v2) and the Department of Finance's assessment roll. The full mailing address is 600 Madison Avenue, New York, NY 10022, in Midtown.

The lot is in the C5-3 zoning district. PLUTO lists a built floor area ratio (FAR) of 17.48 and a maximum commercial FAR of 15 for this lot.

The closest subway station to 600 Madison Avenue is 5 Av/59 St (the N, R and W trains), about 750 feet away in a straight line, roughly 3 minutes on foot. Also nearby: 59 St (the 4, 5, 6, N, R and W trains, connected to Lexington Av/59 St), 5 min walk; 5 Av/53 St (the E and F trains), 5 min walk. Walking times are straight-line estimates; the street route is longer.

The NYC Department of Finance's 2026/27 assessment roll lists 600 FEE, LLC as the owner of record of 600 Madison Avenue (BBL 1012930059). Big buildings are usually held through a company set up for that one property, so the name on the roll can differ from the landlord's brand or the managing agent. Deeds and mortgages for the lot are public in ACRIS, the city's property records system.

Leasemark does not have the building's tenant roster, but SEC filings name companies with offices at 600 Madison Avenue. 3 public companies report the address as their principal executive office: CHICAGO ATLANTIC BDC, INC. (LIEN); IBIO, INC. (IBIO); and 26NORTH BDC, INC.. One investment manager files 13F holdings reports from the address: 26North Partners LP. Private companies do not file with the SEC, so the full list of tenants is longer, and a company can also report a building it owns.

600 Madison Avenue last sold in August 2013 for $210 million, according to the deed recorded with the city. The buyer of record was 600 FEE, LLC. That comes to about $665 per square foot of floor area. The deed is ACRIS document 2013081301209001 (BBL 1012930059) in the city's property records. A sale of the company that owns a building is not recorded as a deed, so it would not show there.

600 Madison Avenue reported an ENERGY STAR score of 54 for calendar year 2024 in its Local Law 84 benchmarking filing. Under Local Law 33, as amended by Local Law 95 of 2019, a score of 85 or higher earns an A, 70 to 84 a B, 55 to 69 a C and under 55 a D, so 54 earns a D. The Department of Buildings assigns the grade a building posts, so the posted label can differ if a filing was corrected. Its site energy use came to 87.5 kBtu per square foot, 5% below the national median of 92.4 for a similar property. Its greenhouse gas emissions were about 2,787 metric tons of CO2e (8.16 kg per square foot).

In the 12 months to October 2026, the Department of Buildings issued first permits for 8 jobs at 600 Madison Avenue. In the last two years, interior work was permitted on 12 floors (floors 1 to 12 and the ground floor). The newest build-out, on floors 5 to 11, was first permitted in September 2026 (construction; filed cost estimate $400,000). A sidewalk shed permit here is active until October 27, 2026. These are the Department of Buildings' DOB NOW work permits for tax lot 1012930059. A permit is approval to do the work; it does not say who the work is for or whether it is finished.

The Department of Finance's 2026/27 assessment roll lists a taxable value of $70.1 million for 600 Madison Avenue. At the Class 4 rate of 10.848% (tax year 2025/26, the latest rate the Department of Finance lists), that is about $7.61 million a year, roughly $24.08 per square foot of floor area, before abatements such as ICAP. The city's property tax records for BBL 1012930059 show the actual bill.

For tax year 2026/27, the NYC Department of Finance puts the market value of 600 Madison Avenue at $163.2 million ($32.6 million of it land) and its assessed value at $73.4 million, the 45% of market value the city assesses for Class 4 property. The city's market value rose 3% from 2022/23 ($157.8 million) to 2026/27.

Owners registered 3 storefronts at 600 Madison Avenue for December 31, 2025, the newest annual filing the city has published, and none stood vacant that day. These are the owners' filings with the Department of Finance under Local Law 157, so a storefront may have come free since. Owners and brokers can list a storefront on Leasemark for free.

No space at 600 Madison Avenue is listed on Leasemark right now. Nearby on Leasemark: office space for lease at 783 Madison 4th Floor in the Upper East Side (994 SF, $66.40/SF/yr). Owners and brokers can list space here for free, and tenants can post a requirement to be matched when space opens up.